Alexis science experiment - how much weight can 3 eggs handle?

This is Alexis eighth grade science experiment. The hardest part was figuring out how to cut raw eggshells in half without breaking it and making them even. Agnes ended up buying a saw that worked to help Alexis with this part.

Can you guess how many pounds of books three half egg shells can hold? I give you a hint it is more than 10 pounds and the answer is in the poster in the photo.